if 2>1:
    print("hello world")
else:
    print("hello world")
    print("hello world")
print("hello world"+"hello world"+"hello world"
      +"hello world"+"hello world"+"hello world")
# print("hello world"+"hello world"+"hello world")
# print("hello world"+"hello world"+"hello world")
# print("hello world"+"hello world"+"hello world")



num = 10
print(type(num))
num = "hello world"
print(type(num))


year = input("请输入一个年份")
print(year)
print(type(year))


year = int(input("请输入一个年份"))
print(type(year))

str1 = 'h'
str2 = 'l'
str3 = 'm'

print(str1,str2,str3,sep='-',end='\t')
